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1. A 523.1-mg sample of impure KBr is treated with excess AgNO3 and 814.5 mg AgBr is obtained. What is the purity of the KBr?

1. A 523.1-mg sample of impure KBr is treated with excess AgNO3 and 814.5 mg AgBr is obtained. What is the purity of the KBr?

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter14: Chemical Equilibrium
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اسئلة اضافية QUANTITATIVE CALCULATION 1. A 523.1-mg sample of impure KBr is treated with excess AgNO, and 814.5 mg AgBr is obtained. What is the purity of the KBr? 2. What weight of Fe₂O3 precipitate would be obtained from a 0.4823-g sample of iron wire that is 99.89% pure? 3. The aluminum content of an alloy is determined gravimetrically by precipitating it with 8-hydroxyquinoline (oxine) to give Al(C,H,ON)3. If a 1.021-g sample yielded 0.1862 g of precipitate. what is the percent aluminum in the alloy? 4. Iron in an ore is to be analyzed gravimetrically by weighing as Fe₂O3. It is desired that the results be obtained to four significant figures. If the iron content ranges between 11 and 15%, what is the minimum size sample that must be taken to obtain 100.0 mg of precipitate? 5. The chloride in a 0.12-g sample of 95% pure MgCl₂ is to be precipitated as AgC1. Calculate the volume of 0.100 M AgNO3 solution required to precipitate the chloride and give a 10% excess. 6. Ammonium ions can be analyzed by precipitating withH₂PtCl, as (NH4)2PtCl, and then igniting the precipitate to platinum metal, which is weighed [(NH4)2PtCl6 -he-a-t Pt + 2NH4C1(g) + 2C1₂(g)]. Calculate the percent ammonia in a 1.00-g sample that yields 0.100 g Pt by this method. 7. A sample is to be analyzed for its chloride content by precipitating and weighing silver chloride. What weight of sample would have to be taken so that the weight of precipitate is equal to the percent chloride in the sample? 8. Pyrite ore (impure FeS₂) is analyzed by converting the sulfur to sulfate and precipitating BaSO4. What weight of ore should be taken for analysis
Transcribed Image Text:اسئلة اضافية QUANTITATIVE CALCULATION 1. A 523.1-mg sample of impure KBr is treated with excess AgNO, and 814.5 mg AgBr is obtained. What is the purity of the KBr? 2. What weight of Fe₂O3 precipitate would be obtained from a 0.4823-g sample of iron wire that is 99.89% pure? 3. The aluminum content of an alloy is determined gravimetrically by precipitating it with 8-hydroxyquinoline (oxine) to give Al(C,H,ON)3. If a 1.021-g sample yielded 0.1862 g of precipitate. what is the percent aluminum in the alloy? 4. Iron in an ore is to be analyzed gravimetrically by weighing as Fe₂O3. It is desired that the results be obtained to four significant figures. If the iron content ranges between 11 and 15%, what is the minimum size sample that must be taken to obtain 100.0 mg of precipitate? 5. The chloride in a 0.12-g sample of 95% pure MgCl₂ is to be precipitated as AgC1. Calculate the volume of 0.100 M AgNO3 solution required to precipitate the chloride and give a 10% excess. 6. Ammonium ions can be analyzed by precipitating withH₂PtCl, as (NH4)2PtCl, and then igniting the precipitate to platinum metal, which is weighed [(NH4)2PtCl6 -he-a-t Pt + 2NH4C1(g) + 2C1₂(g)]. Calculate the percent ammonia in a 1.00-g sample that yields 0.100 g Pt by this method. 7. A sample is to be analyzed for its chloride content by precipitating and weighing silver chloride. What weight of sample would have to be taken so that the weight of precipitate is equal to the percent chloride in the sample? 8. Pyrite ore (impure FeS₂) is analyzed by converting the sulfur to sulfate and precipitating BaSO4. What weight of ore should be taken for analysis
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